There are online programs that offer nursing for people who are already in the health professions and working (LPN, Paramedic, Technicians) but none that are appropriate from start to finish.
As for the math - let me suggest that you either take some remedial math classes and learn it in
Nursing schools, or give up the nursing idea. There is some serious math in nursing.
Example: You want to give drug X to a patient who weighs 55 kilos. Your going to administer .05mg of the drug in 1:10,000 solution for every 10 kilos your patient weighs. You don't have any 1:10,000 but you do have it in 1:100,000 solution. How much do you give? Doc will be yelling at you if you haven't figured this out already.